vRealize Orchestrator and vRealize Automation provide the architecture that supports the Horizon vRealize Orchestrator plug-in functions.

vRealize Orchestrator plug-ins allow seamless automation between the software environment in which the workflows are executed and the products with which the workflows interact. With the Horizon vRealize Orchestrator plug-in, workflows can be exposed natively, through the vSphere Web Client, to delegated administrators, and through the vRealize Automation service catalog. Although entitlement, scheduling, and execution of workflows are exposed through the vSphere Web Client and vRealize Automation, you can customize and configure the workflows only in the vRealize Orchestrator client.

The following diagram illustrates the Horizon vRealize Orchestrator plug-in architecture.

Figure 1. Horizon vRealize Orchestrator Plug-In Architecture
The plug-in is installed in Orchestrator, but the workflows are used in vSphere Web Client and vCloud Automation Center.